A system for reducing nuisance alerts and warnings in a terrain awareness and
warning
system for an aircraft, including determining if the aircraft is within a predetermined
geometric volume surrounding an airport. If the aircraft is within the geometric
volume, then determining the aircraft's current projected flight path for a selected
distance or time and comparing it with at least one approach volume extending from
a runway at the airport towards an outer boundary of the geometric volume. If the
aircraft's current projected flight path is such that the aircraft is expected
to be within the approach volume and stay within the approach volume to the runway,
then inhibiting selected alerts and warnings associated with non-threatening terrain.
